package com.maxd.utils.wx;


import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.net.ssl.SSLContext;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.io.FileInputStream;
import java.io.StringWriter;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.*;


public class HttpClientSSL {
    Logger log = LogManager.getLogger(HttpClientSSL.class);

    private static String payUrl = "https://fraud.mch.weixin.qq.com/risk/getpublickey";
    //商户key
    private static String KEY = "";
    //商户mch_id
    private static String mchId = "";

    public static void main(String[] args) throws Exception {
        Map<String, String> parameterMap = new HashMap<>();
        parameterMap.put("mch_id", mchId);
        parameterMap.put("nonce_str", generateNonceStr());
        try {

            parameterMap.put("sign_type", "MD5");
            parameterMap.put("sign", HttpClientSSL.generateSignature(parameterMap, KEY, "MD5"));
            //要以xml格式传递
            String postDataXML = HttpClientSSL.mapToXml(parameterMap);
            String result = HttpClientSSL.wxRefundLink(postDataXML, mchId);

            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 将Map转换为XML格式的字符串
     *
     * @param data Map类型数据
     * @return XML格式的字符串
     * @throws Exception
     */
    public static String mapToXml(Map<String, String> data) throws Exception {
        org.w3c.dom.Document document = WXPayXmlUtil.newDocument();
        org.w3c.dom.Element root = document.createElement("xml");
        document.appendChild(root);
        for (String key : data.keySet()) {
            String value = data.get(key);
            if (value == null) {
                value = "";
            }
            value = value.trim();
            org.w3c.dom.Element filed = document.createElement(key);
            filed.appendChild(document.createTextNode(value));
            root.appendChild(filed);
        }
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        transformer.transform(source, result);
        String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
        try {
            writer.close();
        } catch (Exception ex) {
        }
        return output;
    }

    private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static final Random RANDOM = new SecureRandom();

    /**
     * 获取随机字符串 Nonce Str
     *
     * @return String 随机字符串
     */
    public static String generateNonceStr() {
        char[] nonceChars = new char[32];
        for (int index = 0; index < nonceChars.length; ++index) {
            nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
        }
        return new String(nonceChars);
    }

    public static String generateSignature(Map<String, String> data, String key, String signType) throws Exception {
        Set<String> keySet = data.keySet();
        String[] keyArray = keySet.toArray(new String[keySet.size()]);
        Arrays.sort(keyArray);
        StringBuilder sb = new StringBuilder();
        for (String k : keyArray) {
            if (k.equals("sign")) {
                continue;
            }
            if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
                sb.append(k).append("=").append(data.get(k).trim()).append("&");
        }
        sb.append("key=").append(key);
        if ("MD5".equals(signType)) {
            return MD5(sb.toString()).toUpperCase();
        } else {
            throw new Exception(String.format("Invalid sign_type: %s", signType));
        }
    }

    /**
     * 生成 MD5
     *
     * @param data 待处理数据
     * @return MD5结果
     */
    public static String MD5(String data) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] array = md.digest(data.getBytes("UTF-8"));
        StringBuilder sb = new StringBuilder();
        for (byte item : array) {
            sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
        }
        return sb.toString().toUpperCase();
    }

    public static String wxRefundLink(String postDataXML, String mch_id) throws Exception {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse httpResponse = null;
        try {
            //获取微信支付api证书
            KeyStore keyStore = getCertificate(mch_id);
            SSLContext sslContext = SSLContexts.custom().loadKeyMaterial(keyStore, mch_id.toCharArray()).build();
            SSLConnectionSocketFactory sslf = new SSLConnectionSocketFactory(sslContext);
            httpClient = HttpClients.custom().setSSLSocketFactory(sslf).build();
            HttpPost httpPost = new HttpPost(payUrl);

            StringEntity reqEntity = new StringEntity(postDataXML);
            // 设置类型
            reqEntity.setContentType("application/x-www-form-urlencoded");
            httpPost.setEntity(reqEntity);
            String result = null;
            httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            result = EntityUtils.toString(httpEntity, "UTF8");
            EntityUtils.consume(httpEntity);
            return result;
        } finally {//关流
            httpClient.close();
            httpResponse.close();
        }

    }

    /**
     * @description: 获取微信支付api证书
     */
    private static KeyStore getCertificate(String mch_id) {
        //try-with-resources 关流
        try (FileInputStream inputStream = new FileInputStream(new File("E:\\apiclient_cert.p12"))) {
            KeyStore keyStore = KeyStore.getInstance("PKCS12");
            keyStore.load(inputStream, mch_id.toCharArray());
            return keyStore;
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }
}